// Copyright 2023 Greptime Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use std::sync::Arc;

use common_meta::DatanodeId;

pub type NodeExcluderRef = Arc<dyn NodeExcluder>;

/// [NodeExcluder] is used to help decide whether some nodes should be excluded (out of consideration)
/// in certain situations. For example, in some node selectors.
pub trait NodeExcluder: Send + Sync {
    /// Returns the excluded datanode ids.
    fn excluded_datanode_ids(&self) -> &Vec<DatanodeId>;
}

impl NodeExcluder for Vec<DatanodeId> {
    fn excluded_datanode_ids(&self) -> &Vec<DatanodeId> {
        self
    }
}
